What is a characteristic of four-stroke engines at low RPM?

Four-stroke engines are designed to have a specific operational cycle that takes place over four strokes of the piston: intake, compression, power, and exhaust. A defining characteristic of these engines is their ability to maintain stable operation at low RPMs.

At low RPM, four-stroke engines can deliver consistent power and torque thanks to the design of their intake and exhaust systems and the timing of their valves. This stability is essential for applications like idling in vehicles or running at low speeds in various machinery, where smooth operation is necessary for usability and comfort.

In contrast, other characteristics or challenges may arise at low RPMs, such as a potential lack of power in certain engine designs or the requirement for adjustments in two-stroke engines, which operate differently. However, the four-stroke engine's inherent design allows for stable operation, making it more suitable for a range of applications requiring reliable performance at lower speeds.